Re: [R] testing for significantly different slopes

2008-03-06 Thread Gregory Warnes
>> What's the problem? > > The problem is that I would like to do a pair-wise comparison > between the > multiple slopes. For example with this model: > > lm1 <- lm (Sepal.Length ~ Species/Sepal.Width -1, data=iris) > > # truncated output from summary(lm1) > # just the slope terms > Speciessetos

Re: [R] testing for significantly different slopes

2008-03-05 Thread Dylan Beaudette
ary): +61 7 3826 7304 > Mobile: +61 4 8819 4402 > Home Phone: +61 7 3286 7700 > mailto:[EMAIL PROTECTED] > http://www.cmis.csiro.au/bill.venables/ > > -Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > On Beh

Re: [R] testing for significantly different slopes

2008-03-05 Thread Bill.Venables
EMAIL PROTECTED] http://www.cmis.csiro.au/bill.venables/ -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dylan Beaudette Sent: Thursday, 6 March 2008 9:28 AM To: r-help@r-project.org Subject: [R] testing for significantly different slopes Hi, How would one go

[R] testing for significantly different slopes

2008-03-05 Thread Dylan Beaudette
Hi, How would one go about determining if the slope terms from an analysis of covariance model are different from eachother? Based on the example from MASS: library(MASS) # parallel slope model l.para <- lm(Temp ~ Gas + Insul, data=whiteside) # multiple slope model l.mult <- lm(Temp ~ Insul/G